Laser Induced Transient Photothermal Radiometry in Opaque Samples
A radiometer system has been designed and constructed for measurements of optical, thermal and related properties of two distinct categories of opaque samples. It was used exclusively for highly light absorbing and/or diffusing samples (protective coatings and ceramics) and highly reflecting samp...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English |
| Published: |
1998
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/9451/1/FSAS_1998_38_A.pdf |
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| Summary: | A radiometer system has been designed and constructed for measurements of
optical, thermal and related properties of two distinct categories of opaque samples.
It was used exclusively for highly light absorbing and/or diffusing samples
(protective coatings and ceramics) and highly reflecting samples (metals and its
alloys). In the measurements, the signals were initially generated by localised pulsed
laser heating of the sample. The signals were then monitored directly by detecting
changes in infrared radiation or indirectly by measuring the deflection of the
reflected probe beam.
The underlying theory behind the technique and the design criteria for the
radiometer are discussed. The theory has been described for the case of direct signal
detection and as well as for the case of indirect signal detection.
The performance of each type of detection was duly evaluated and found that
the indirect detection displayed much higher signal-to-noise ratio for the respective
intended application. |
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